Large nozzle for hot runner mold
AssigneeHusky Injection Molding Systems Ltd.
InventorPaul Brown
Life of this patent
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Abstract
The present invention relates to a system for injection molding large parts. The system includes a large diameter hot runner valve gated nozzle assembly which can be removed for servicing. The assembly includes a heated nozzle body having a substantially C-shaped flow channel for conveying molten plastic to a nozzle having an injection gate and a valve arrangement for opening and closing the injection gate. The assembly further includes a nozzle extension attached to the nozzle body so as to accommodate thermal expansion of the nozzle extension. A manifold for supplying molten plastic material to the nozzle assembly is mounted and retained within a slot in the nozzle extension so as to permit sliding action of the manifold.
Claims11
An injection molding system for making large parts which comprises:
- a nozzle body housing a flow channel through which liquified plastic material flows;
- said flow channel having a nozzle at a first end and being connected to a source of said plastic material at a second end;
- said nozzle body further containing valve means for opening and closing said nozzle and an injection gate in a mold;
- said valve means comprising a cylinder within said nozzle body, a piston within said cylinder, and a valve stem connected to said piston;
- said flow channel within said nozzle body passing around said cylinder;
- a nozzle extension mounted to said nozzle body to form a nozzle assembly therewith;
- and
- said nozzle extension having a slot for housing a manifold connected to said plastic material source and a passageway for connecting said second end of said flow channel in said nozzle body with said manifold.
An injection molding system for making large molded parts which comprises:
- a mold plate having at least one mold cavity;
- a large diameter hot runner valve gated nozzle assembly including a heated nozzle body, a nozzle extension attached to said nozzle body and a manifold connected to a source of molten plastic material;
- and
- means for accommodating thermal expansion of said manifold, said thermal expansion accommodating means comprising a slot in said nozzel extension for receiving said manifold and means for trapping said manifold in said slot and for permitting only sliding action of said manifold through said slot due to thermal expansion.
Dependencies are inferred from the claim text.